diff options
| -rw-r--r-- | README.md | 13 | ||||
| -rw-r--r-- | src/main.rs | 12 |
2 files changed, 19 insertions, 6 deletions
@@ -8,12 +8,17 @@ potentially more. No plans for RV32I or RV32/64E. Currently, the emulator is nowhere near complete, its not even at rv64i, but it does work for a subset of it. -The emulator will load a raw binary image from the file `./img` into RAM, -which starts at 0x80000000 and is currently 1MiB, +The emulator will load a raw binary image from a file specified as a CLI argument into RAM, +which starts at 0x80000000 and is currently 16MiB, and start execution at the start of the image/ram. There is also a debug out page starting at `0x00000000`-`0x00001000`. Anything written to it will be logged out in hex. -Currently there is no input, altho i might get around to making -an early UART kinda soon. +There is also a UART at `0x00001000`-`0x00002000`, the interface is quite simple: +- byte `0`: Data. When written, writes out the character + When read, reads a character from the buffer, or 0 if empty. +- byte `1`: Status. Read-only. Least significant bit is `TX_READY` and indicates whether + the UART is ready to be written to. Currently always 1. + Next least significant is `RX_READY`, indicates whether the read buffer + has any data to read. diff --git a/src/main.rs b/src/main.rs index cdaa6eb..67186bb 100644 --- a/src/main.rs +++ b/src/main.rs @@ -5,6 +5,7 @@ // See LICENSE file in the project root for full license text. use std::{ + env, error::Error, fs::File, io::{self, Read}, @@ -41,9 +42,16 @@ fn read_file_to_buffer(path: &str, buffer: &mut [u8]) -> io::Result<usize> { } fn main() -> Result<(), Box<dyn Error>> { - let mut ram = Ram::try_new(1024 * 1024 / 4096)?; + let mut ram = Ram::try_new(16 * 1024 * 1024 / 4096)?; let buf = ram.buf_mut(); - read_file_to_buffer("./img", buf)?; + + let args: Vec<String> = env::args().collect(); + + if args.len() != 2 { + eprintln!("USAGE: trve <ram_image>") + } + + read_file_to_buffer(&args[1], buf)?; let uart = BasicUart::new(); let uart = uart.spawn_poller(Duration::from_millis(10)); |